caa a22 4500 37894150X CHVBK 20180305123653.0 cr unu---uuuuu 161128e20040712xx s 000 0 eng 10.1515/BOT.2004.023 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2004.023 Delivopoulos Stylianos G. Ultrastructure of tetrasporogenesis in the red alga Rhodymenia californica var. attenuata (Rhodymeniaceae, Rhodymeniales, Rhodophyta) [Elektronische Daten] [Stylianos G. Delivopoulos] Tetrasporogenesis in Rhodymenia californica var. attenuata is accomplished in four developmental stages. The first stage is represented by a uninucleate tetraspore mother cell sourrounded by an electron transparent cell wall. Dictyosome activity and endoplasmic reticulum are not evident at this stage and starch formation does not occur. Thylakoids are formed from unraveling concentric lamellar bodies. Multiplication of plastids results from fission of the existing organelles. The tetraspore mother cell increases in size and undergoes decussate cruciate division by cleavage infurrowing, resulting in the formation of four tetraspores which represents the second stage of tetraspore development. Also, granular vesicles are formed from the endoplasmic reticulum. The third stage is characterized by the formation of fibrous vacuoles from the fibrous vacuole associated organelles. The fourth developmental stage is represented by maturation of tetraspores and is signaled by the massive production of cored vesicles from hypertrophied dictyosomes and the presence of abundant starch granules. Mature tetraspores are surrounded by a bi-layered wall and the tetrasporangial wall, while unbranched, tubular structures run parallel to the plasmalemma. Copyright © 2004 by Walter de Gruyter GmbH & Co. KG Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Botanica Marina Walter de Gruyter 47/3(2004-07-12), 222-230 0006-8055 47:3<222 2004 47 botm https://doi.org/10.1515/BOT.2004.023 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2004.023 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Delivopoulos Stylianos G. NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 47/3(2004-07-12), 222-230 0006-8055 47:3<222 2004 47 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter